.switchLayer{
    @extend .center;
    position: absolute;
    right: 12px;
    bottom: 133px;
    background: rgba(0,0,0,0.72);
    z-index: 500;
    padding: 10px;
    width: 36px;
    height: 36px;
    color: #fff;
    cursor: pointer;
    border-radius: 2px;
    i{
        font-size: 36px;
    }
    &:hover{

    }
}